Untangle a Broken Heart via Janus Kinase 1.

Untangle a Broken Heart via Janus Kinase 1.
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通过 Janus 激酶 1 解开破碎的心。

DOI:
10.1161/circresaha.117.311684
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发表时间:
2017
影响因子:
20.1
通讯作者:
Wang,Yibin
Wang,Yibin
中科院分区:
医学1区
文献类型:
--
作者:
Gao,Chen;Wang,Yibin

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590 Circulation Research 2017年9月1日病理生理学,我们目前对应激相关信号如何促进蛋白质聚集的认识仍存在重大差距。在概念层面上,McLendon等人4在此报道的研究揭示了一条有趣的、新的、潜在的非常重要的分子路径,将JAK 1介导的应激信号传导与蛋白质聚集联系起来。然而,这仍然是一个非常早期阶段的初步调查结果,许多问题仍有待充分解决。首先,目前的研究仅测试了JAK 1对蛋白质聚集体形成的影响,而没有测试JAK 1对已建立的蛋白质聚集体溶解的影响。这是一个重要的飞跃,需要完成,以充分证明靶向JAK 1失活的治疗潜力。目前的研究还提出了关于JAK 1介导的信号如何通过蛋白酶体途径改变蛋白质降解能力的问题,以及它是否涉及典型的JAK/STAT介导的基因调控或独立于STAT的非典型过程。目前的验证研究仅在体外模型系统中使用培养的新生肌细胞进行,而进一步的体内证据对于支持该发现的生理和翻译相关性至关重要。尽管如此,McLendon等人的报告4再次展示了无偏见的全基因组分析的力量,以发现新的分子途径和基因-基因相互作用。事实上,在筛选的14个高置信度命中中,还鉴定了JAK 1以外的几种信号分子,包括酪蛋白激酶1 γ 2、Ptprv(一种跨膜酪氨酸蛋白磷酸酶)和CDC 42结合蛋白激酶α。这些候选基因中的每一个都可能对导致蛋白质聚集的潜在调控网络的不同方面做出贡献。在我们解开一颗破碎的心之前,我们确实有很多工作要做,以解开蛋白质聚集和蛋白质毒性的复杂调控网络。
590 Circulation Research September 1, 2017 pathophysiology, there is still a significant gap in our current knowledge about how stress-related signaling contributes to protein aggregation. At conceptual level, the study reported here by McLendon et al4 has revealed an interesting, new, and potentially very important molecular path linking JAK1-mediated stress signaling with protein aggregation. However, this is still a preliminary finding at its very early stage, and many questions remain to be fully addressed. First of all, the current study only tested the effect of JAK1 on the formation of protein aggregate but not on the dissolution of the established protein aggregate. This is an important leap needed to be fulfilled to fully demonstrate the therapeutic potential of targeted JAK1 inactivation. The current study also raises questions about how JAK1-mediated signaling alters protein degradation capacity via proteasome pathway, and whether it involves canonical JAK/STAT-mediated gene regulation or a noncanonical process independent of STATs. The current validation study was conducted only in an in vitro model system using neonatal myocytes in culture, whereas further in vivo evidence would be critical to support the physiological and translational relevance of this finding. Nevertheless, the report by McLendon et al4 showcased again the power of an unbiased genome-wide analysis to uncover novel molecular pathways and gene–gene interactions. In fact, among the 14 high-confidence hits from the screening, several signaling molecules other than JAK1 were also identified, including casein kinase 1 γ 2, Ptprv (a transmembrane tyrosine protein phosphatase), and CDC42 binding protein kinase α. Each of these candidate genes may contribute to a different aspect of the underlying regulatory network leading to protein aggregation. There are indeed a lot of work ahead of us to untangle this complex web of regulatory network in protein aggregation and proteotoxicity before we can untangle a broken heart.
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